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Construction of SiO 2 @MWNTs incorporated PVDF substrate for reducing internal concentration polarization in forward osmosis
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.memsci.2018.07.043
Xuan Zhang , Liang Shen , Chen-Yu Guan , Chu-Xuan Liu , Wan-Zhong Lang , Yan Wang

Abstract This work provides a facile and effective way of incorporating SiO2@MWNTs in polyvinylidene fluoride (PVDF) substrate to alleviate the internal concentration polarization (ICP) impact of the resultant thin film composite forward osmosis (TFC-FO) membranes for the first time. The in-situ decoration of multi-walled carbon nanotubes (MWNTs) using tetraethyl orthosilicate (TEOS) as precursor was conducted, resulting in improved hydrophilicity and the excellent dispersion of synthesized SiO2@MWNTs in PVDF membrane substrates accordingly. Effects of the SiO2@MWNTs concentration on the morphologies and properties of the modified substrates, and further impact on the polyamide (PA) layer structure are investigated via various characterizations. Besides, the intrinsic separation properties and forward osmosis performance of resultant TFC-FO membranes are also systemically studied. In comparison with the control TFC membrane, SiO2@MWNT-modified TFC membranes exhibit higher water fluxes with the enhanced membrane selectivity, as indicated by the decreased JS/JV values (from 1.10 to 0.19 g/L). This work therefore presents an alternative approach to prepare TFC-FO membranes with enhanced water flux as well as increased selectivity.

中文翻译:

SiO 2 @MWNTs 的结构包含 PVDF 基底以减少正向渗透中的内部浓差极化

摘要 这项工作首次为将 SiO2@MWNTs 掺入聚偏二氟乙烯 (PVDF) 基底提供了一种简便有效的方法,以减轻所得薄膜复合正向渗透 (TFC-FO) 膜的内部浓差极化 (ICP) 影响。以原硅酸四乙酯 (TEOS) 为前驱体对多壁碳纳米管 (MWNT) 进行原位装饰,从而提高了亲水性,并相应地提高了合成的 SiO2@MWNT 在 PVDF 膜基材中的分散性。通过各种表征研究了 SiO2@MWNTs 浓度对改性基材的形态和性能的影响,以及对聚酰胺 (PA) 层结构的进一步影响。除了,还系统地研究了所得 TFC-FO 膜的固有分离特性和正渗透性能。与对照 TFC 膜相比,SiO2@MWNT 改性的 TFC 膜表现出更高的水通量和增强的膜选择性,如 JS/JV 值降低(从 1.10 到 0.19 g/L)所示。因此,这项工作提出了一种制备具有增强水通量和选择性的 TFC-FO 膜的替代方法。
更新日期:2018-10-01
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